package learningPackage;
import java.awt.FlowLayout;
//gives the layout
import java.awt.event.ActionListener;
//this makes the field wait for an event.
import java.awt.event.ActionEvent;
import javax.swing.JOptionPane;
import javax.swing.JFrame;
import javax.swing.JTextField;
//creates a field where we can type text.
import javax.swing.JPasswordField;
//creates a text field where the text typed is hidden with asterics.
class tuna extends JFrame
{
private JTextField textField1;
private JTextField textField2;
private JTextField textField3;
private JPasswordField passwordField;
public tuna()
{
super("Title Text");
textField1 = new JTextField(10);
//sets a the default value of 10. 
add(textField1);
textField2 = new JTextField("Enter a Text");
//sets default text of "Enter a Text" without the quotes
add(textField2);
textField3 = new JTextField("Uneditable", 20);
//Displays Uneditable with a default value of 20.
//To make this Uneditable, you must do this...
textField3.setEditable(false);
//this makes the textField uneditable.
add(textField3);
passwordField = new JPasswordField("myPassword");
add(passwordField);
thehandler Handler = new thehandler();		
textField1.addActionListener(Handler);
textField2.addActionListener(Handler);
textField3.addActionListener(Handler);
passwordField.addActionListener(Handler);
/*
* The addActionListener method takes an object of Event Handler class. 
* 
* Therefore, we must create an object of Event Handler Class.
* 
* 
* The addActionListener method takes an object because, sometimes, we might
* have different classes with different code to execute. So, we pass the object to 
* identify which class code is to be executed. 
*/
}
class thehandler implements ActionListener
{
/*
* In order to handle events in Java, you need Event handler Class.
* and, that Event Handler Class must implement ActionListener.
* 
* What the ActionListener does is that 
* 
* It will wait for some Event to happen and after that particular event happens, 
* it will implement some piece of code.
*/
public void actionPerformed(ActionEvent event)
{
String string = "";
if(event.getSource()==textField1)
string = String.format("Text Field 1 : %s", event.getActionCommand());
else if(event.getSource()==textField2)
string = String.format("Text Field 2 : %s", event.getActionCommand());
else if(event.getSource()==textField3)
string = String.format("Text Field 3 : %s", event.getActionCommand());
else if(event.getSource()==passwordField)
string = String.format("Password Field : %s", event.getActionCommand());
//when the user presses enter key after entering text, this actually stores the 
//thing entered into the String. 
JOptionPane.showConfirmDialog(null, string);
}
}
}
public class Apples {
public static void main(String[] args) 
{
tuna Srivathsan = new tuna();
Srivathsan.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//this would close the window when X button is pressed.
Srivathsan.setSize(500, 500);
Srivathsan.setVisible(true);
Srivathsan.setLocationRelativeTo(null);
}
}

import java.awt.FlowLayout;
//gives the layout

import javax.swing.*;
public class SingleComponentLayoutProblem extends JFrame {
private final JTextField textField1;
private final JTextField textField2;
private final JTextField textField3;
private final JPasswordField passwordField;
public SingleComponentLayoutProblem() {
super("Title Text");
JPanel panel = new JPanel(); // uses FlowLayout be DEFAULT
add(panel);
textField1 = new JTextField(10);
//sets a the default value of 10. 
panel.add(textField1);
textField2 = new JTextField("Enter a Text");
//sets default text of "Enter a Text" without the quotes
panel.add(textField2);
textField3 = new JTextField("Uneditable", 20);
//Displays Uneditable with a default value of 20.
//To make this Uneditable, you must do this...
textField3.setEditable(false);
//this makes the textField uneditable.
panel.add(textField3);
passwordField = new JPasswordField("myPassword");
panel.add(passwordField);
}
public static void main(String[] args) {
Runnable r = () -> {
SingleComponentLayoutProblem sclp = 
new SingleComponentLayoutProblem();
sclp.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//this would close the window when X button is pressed.
// don't guess sizes! ..
//sclp.setSize(500, 500); 
// .. instead ..
sclp.pack();
sclp.setVisible(true);
sclp.setLocationRelativeTo(null);
};
SwingUtilities.invokeLater(r);
}
}